Seal for shafts



May 24 1932 A. c. DURDIN, JR 1,859,436

SEAL FOR SHAFTS Filed oct. 15, 1928 fPateunt-ed May 24, 1.932 p sectionof the sealing l rasant miran' Sraras PATENT Vonirica auausrus c.Dunham., 'or cmcao'o, ILLINOIS, Assz'ciron ro cmcaoo Pour com- PANY, OFCHICAGO,

ILLINOIS, A CORPORATION or ILLiNoIs SEAL Foa seams Application ledOctober 13, 1928. Serial No. 312,286.

This invention relates to seals for shafts,

and its princi al object is to, provide iinproved means orpreventingleakage of llquid (or gas). from a pump or compressor casing,at the place where the shaft passes throu h a wall thereof. Seals of thecharacter forming the subject matter of this specification 'usuallycomprise a Hanged metal ring held in close contact with the wall of thecase, and a rubber ring held under compression between the flanged ringand shaft, but due to reciprocatin or oscillation of the shaft throughthe rubber ring, 'the latter 1s subject to wear with the result thatleaks are likely to occur. 4

One object of the present invention is to etween the shaft and asurrounding flange, which ring shall be free to roll or rock upon theshaft or flange in case of oscillation or re- -provide-a resilient seal.ring fitting tightly ciprocation thereof, whereby the abrasive ac tionof the shaft on the ring is entirely elim inated. Another object is toprovide a double seal whereb leakage is prevented at both sides of a'lcham er.

With these and other objects and advantages in view, this inventionconsists inI a seal for shafts in which the resilient seal ring iscapable of rolling or rocking on the shaft or the surrounding member inwhich the seal ring is confined. It -further consists in a double sealin which. a'single spring is emplo ed for holding two seals in operativeconditlon. It further eonsistsin the several novelrfeatures hereinafterfully set forth and claimed. The invention is clearly illustrated in theaccompanying drawings in which- Figure 1y is a central vertical sectionthrough a fragment of a pump showin a simple embodiment of the inventionapplled thereto; y

Fig/2 is an' enlarged detail longitudinal members; Fig. 3 is a detailvertical cross section taken e on the line 3 3 of Fig. 2;

Fig. f1 is a detail section showing a inodied form of the invention; and

Fig. is a detail section showing a second modification.

Referring tosaid drawings, and rst'to the shaft, and

.is apt to leak out .gas will leak out Figs. 1, 2'and 3, the referencecharacter 10,

designates the'casing of a water pump, compressor or the like, throughwhich extends a shaft 11, journaled in suitable bearings and having anim'pellcr 12, or other mechanism thereon, which is rotated bythe shaft.A'suitable motor (not shown) or other power element, is provided forrotating the shaft.

The shaft extends out through a wall 13 ofthecase and the clearancespace between the aperture" 1n the wall, through which lthe shaftextends, must be protected against leakage, otherwise liquids or gaswill leak out at this place. If the case 10 is used as a'liquid pumpcase, the liquid case 1s used as a compressor case, the air or Inaccordance with the present invention,

around the shaft, and if the,

around the shaft unless an\ effective leak `proof Joint is providedaround I provide a iianged retainlng ring 14, pref? erably formed ofhardened steel, which ring fits loosely on the shaft and bears againstone face of the case wall or against one face of a washer 15 interposedbetween the wall and ring. Where the case is formed of boltedtogethersections, split lengthwise .of the shaft, as shown by the dotted linesin Fig. 1,

a washer 15 is placed against the wall to cover the joint between thetwo case sections and a leak proof joint is providedbetween the washerand case wall as, forl instance, by a rubber or other gasket 16. Thewasher may be considered as part of the case wall. The contacting facesof the flanged ring and case wall, or washer, are ground true to make avery close running fit, so that the possibility of leakage between thecontacting faces is prevented so long as the two are held in contact. i

The side wall or web 17 and yflange 18 of the anged ring, together withthe shaft, form an annular channel 19 in which is contained a resilientseal ring 20 formed of rubber, or other resilient composition, which inits preferred form is' round -in cross section throughout its extent.The internal diameter of the seal ring is slightly less than that of thediameter of the shaft upon which it is used, and its external diameteris slight-v y greater than the internal diameter of the nge .surroundingthe seal ring, wherebyV when contained in the channel 19, the seal ringis held under compression between the shaft and Bange, whereas itslateral sides are notheld under ressure. The seal ring,

. therefore, provides eak proof joint with the shaft 11 and Bange of theBanged ring 14. Bearing against the edge of the Bange 18,

f is a shoulder or metal washer 21 which fits loosely on the shaft andvis spring pressed against the Banged ring by a coiled compres# sionspring 22 surrounding the shaft 11. One end of the spring bears againstthe vWasher l' 21 and the other against some abutment or shoulder. Y

i In the drawings a double seal is illustrated for the shaft, and` insuch cases a housing 23 -is provided around the seals. 'Where the case10 is split as shown, a ring 24' is provided around theshaft at the freeend of the housf, 4ing and is bolted or otherwise secured to thehousing. The ring 24 may be considered as partof the case wall: One ofthe Banged 'rings 14 bears against an end face of the ring 24, andsaidring 24 is also ground to provide im a tight running vit with theBangedring 14.

When the double seal ring is employed, the coiled compression spring 22lbears against the two washers 21 and'holds them against -the Bangedrings 14, thereby holding the Banged rings in close contact .with thecon'- tiguous faces of the case walls or rings 15, 'and 24, if thelatter are used. Y When the case is not split lengthwise of the shaft,the rings 15 and 24 maybe omitted, as will be understood, 'and theBanged rings 14 in such casesw bear directly against the Bat groundfaces of the casewall. If desired, the cavity in the housing may serveto contain oil or other lubricant. It will be observed that leakage pastthe seal is practically impossible.

The ground contacting faces of the Banged ring and casing being held inqlose contactby' the spring, leakage between said faces is prevented,and since the faces of the resilient seal ring bear4 tightly against theshaft. 11

land flange 18 of the Banged ring, leakage is prevented between thoseparts. Inasmuch as the lateral sides of the seal ring are not confined,it is free to roll or rock on the shaft. Consequently, during anyreciprocating or y oscillating movements ofthe shaft, .the part of theseal ring contacting therewith moves with the shaft, and any tendencyfor wear, which would otherwise be' occasioned by the shaft movingrelative to the contacting face of the resilient ring, is entirelyeliminated.

In'the modified form of the'inventionl illustrated in Fig. 4, theresilient ring 20 is shown as of oval or elliptical form in crosssection. otherwise the construction -is substantially the same as thatshown in Fig. 1. i

'In the modified form illustrated in Figs,

the resilient ring 20" is shown as'of truncated v triangular formation,the 'base 20 of the triangle contacting with the shaft `and its apexportion 2Q contactinlg with the Bange of the Banged ring 14.whic may beooved asv at 14 toreceive the apex or perip eral portion of the ring.

, I cl'alm as new, and desireto secure by Letters Patent: l

1. In a device of the class described, the

combination with a rotatable shaftl and a wall, i

combination' with a rotatable slaft anda wall through which the'shaftvextends, of a ring surrounding the shaft and bearing against said wall,said ring having a peripheral Bange spaced from the shaft, a spring for.l I

pressing said ring against said wall, and a rubber seal ring held underpressure solely by said Bange and shaft and frictionally connecting saidvfirst mentioned ring with the shaft to rotate therewith.

3. In a device of the class described, the.-

combination with la rotatable shaft and a. wall through which the shaftextends, of va ring surrounding the shaft andbearing against said Wall,said ring having a peripheral Bange spaced from the shaft, a' spring forpressing 'said ring againstsaid wall, and

a resilient seal ring held under pressure solely by said Bange and shaftand frictionally connecting said first mentioned-ring with'the shaft torotate therewith, the body of said ring being round in cross section.

4. In a device of the class described, the Lcombination with a rotatableshaft and a wall through which the shaft extends, of a Banged ringlsurrounding the shaft and bearing against said wall, the Bange of saidring surrounding the shaft and being spaced therefrom, an annular membersurroundn the shaft and bearing against the Bange'o said ring, andformingt together with said shaft .and Banged ring an annular channelaround the shaft, a resilient seal ring contained in said channel andconfined under pressure solely between the shaft and. Bange andfrictionally connecting said Banged ring with the. shaft .to rotatetherewith,and.ascoiled -compression sping surrounding the shaft andbearing against said annular member, said spring acting to hold the,Banged rmg in` described, 'the `.combination'with a lrotatable shaftand a close contact with the wall.

5. In a-device of the lass wall through which the shaft extends, of avand flanged ring an annular channel around the shaft, a resilient sealring contained in said channel and confined under pressure be,- tweenthe shaft and flange and frictionally connecting said flanged ring withthe shaft to rotate therewith, the lateral sides of said` .ring beingfree, and a coiled compression spring surrounding the shaft and bearingagainst said annular member, said sprmg acting to hold the 'flanged ringin close contact with the wall. t

6 In' a device of the class described, the

combination with a rotatable shaft and a wall through which the shaftextends. of a flanged member surrounding the. shaft and having a flatpart bearing against said wall, the flange bf vsaid member surroundingthe shaft and being spaced therefrom, an annular member surrounding theshaft and bearing against the edge of the flange of said flanged member,a resilient seal ring located between 'said flanged member and annularmember and held under compression solely between the flange and shaft.said seal ring frictionally connecting said flanged member with theshaft/t0 rotate therewith and the part inengagement with the shaft beingfree to yield laterally with relation to 'that part in engagement withthe flange, and a coiled compression spring bearing against the annularmember and acting to hold the flanged member in close contact with saidwall.

AUGUSTUS c. DURDIN,l JR.

